نتایج جستجو برای: j12

تعداد نتایج: 278  

Journal: :Journal of magnetic resonance 2006
Jorge L Neves Björn Heitmann Timo O Reiss Heloiza H R Schor Navin Khaneja Steffen J Glaser

The limits of polarization transfer efficiency are explored for systems consisting of three isotropically coupled spins 1/2 in the absence of relaxation. An idealized free evolution and control Hamiltonian is studied, which provides an upper limit of transfer efficiency (in terms of transfer amplitude and transfer time) for realistic homonuclear spin systems with arbitrary Heisenberg-type coupl...

2012
Timothy J. Halliday

In this note, we correct an error from Halliday (2010) in which we explored the degree to which household size is measured with errors. After our correction, we find that an upper bound on the variance of these measurement errors increases by a factor of four. In fact, our calculations suggest that these errors could be as high as 20% of the total variation in household size. However, ∗E-mail: ...

2009
Paul Schweinzer

We study the alternating-offers bargaining problem of assigning an indivisible and commonly valued object to one of two players who jointly own this object. The players are asymmetrically informed about the object’s value and have veto power over any settlement. There is no depreciation during the bargaining process which involves signalling of private information. We characterise the perfect B...

2003
Alois Stutzer Bruno S. Frey

This paper analyzes the causal relationships between marriage and subjective well-being in a longitudinal data set spanning 17 years. We find evidence that happier singles opt more likely for marriage and that there are large differences in the benefits from marriage between couples. Potential, as well as actual, division of labor seems to contribute to spouses’ well-being, especially for women...

2003
Rainer Winkelmann

This paper uses recent data for Germany and a new outcome variable to assess the consequences of parental separation on the well-being of youths. In particular, it is considered how subjective well-being, elicited from an ordinal 11-point general life satisfaction question, differs between youths living in intact and non-intact families, holding many other potential determinants of well-being c...

2008
Fabio MARIANI Fabio Mariani

We model virtue as an asset on the marriage market: since men value virginity in prospective mates, preserving their virtue increases girls’ chances of getting a "good" husband, and therefore allows for upward social mobility. Consistent with some historical and anthropological evidence, we find that the diffusion (and the social value) of virginity, across societies and over time, can be deter...

2011
Pranab Bardhan Michael Luca Dilip Mookherjee Francisco Pino Abhirup Sarkar

This paper studies how land reform and population growth affect land inequality, incorporating indirect effects owing to their influence on household divisions and land market transactions. An intra-household model of joint production explains how divisions and land transactions emerge to avoid inefficient free-riding, and how they are affected by land reform and growth in household size. These...

2012
Dirk Bethmann Michael Kvasnicka

A Theory of Child Adoption Women can bear own children or adopt them. Extending economic theories of fertility, we provide a first theoretical treatment of the demand for adoption. We show that the propensity to adopt a child increases in the degree of own altruism, infertility, relatedness to the child, costs of own child birth, and any adoption-specific monetary return that is received net of...

2009
Wolfgang Frimmel Martin Halla Rudolf Winter-Ebmer

We show that changes in assortative mating patterns along the dimensions of age, ethnicity, religion and education are not responsible for the increasing marital instability over the last four decades in Austria. Without the rise in the age at marriage, divorce rates would be considerably higher. Immigration and secularization, and the resulting supply of spouses with diverse ethnicity and reli...

2003
Linda Y. Wong

Only 5.5 percent of black males married white females in 1990, and the family-income premium for intermarried black males was 7 percent. This paper estimates the impact of the mating taboo, courting opportunities, and individual endowments on the black male marriage market. Results indicate that eliminating the mating taboo would raise the intermarriage rate from 5.5 to 64 percent, and do away ...

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